My Galaxy 5 has this problem for some months now: wifi stops working, I try to enable it and the phone says "Error" without any other further information. The only way to make it work again is rebooting the phone. I think this problem has been related here before.

ar6000 is the driver for the Atheros 6k Wifi chipset. From browsing on XDA, it seems to be a common issue with Galaxy, not sure if there is any fix yet, though many reported that reboots works.
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Lie RyanSep 11 '11 at 0:18

Yeah, I've noticed this is a pretty common problem unfortunately. I had the hope that bringing this log would help to understand the causes, but up to now it's being useless. Thanks for the link about the driver.
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Paulo GuedesSep 12 '11 at 16:06

4 Answers
4

I've seen a number of people report that the WLAN test dialer code will allow the driver to reload properly (example). I believe it's *#*#526#*#* on many Samsung phones, but this post indicates that it may also be *#*#528#*#* or *#*#232339#*#*. This may not work on all devices, since manufacturers tend to include/remove different dialer codes almost at a whim.

If you're unfamiliar with dialer codes, simply open your dial pad and enter the sequence as though you were attempting to dial the number *#*#526#*#*. Your phone should then jump to the WLAN test facility.

All three of these codes bring up the correct interface on my GT-5570, which manages to successfully load the drive; unfortunately it then fails to find any networks when it scans.
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JulesMay 8 '12 at 11:32